Unfortunately I exchanged contact information and handled the sale independently (probably against offerup's terms of service). I did an invoice, bill of sale and took payment directly. For payment you have options like sending an invoice through PayPal (I highly highly advise staying far away from PayPal though), sending a Google pay request, or just working with the buyer using something like venmo. Buyers seem to be very understanding of the problem and need the item so they want to work with you to make it work.
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